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The circuit on newer cars with automatic transmissions has a neutral safety, or neutral start switch installed between the ignition switch and the starter. The ignition switch cannot operate the starter motor unless the transmission is in park or neutral.
Late model vehicles with manual transmissions have a starter/clutch interlock switch that requires the clutch to be depressed to the floor.Neutral Safety Switch
Normal operations of a neutral safety switch provides a quick check for the adjustment of the gear selector linkage.

To do this, move the selector slowly until it clicks into the PARK position.

Turn the ignition key to the START position.

If the starter operates, the PARK position is correct.

After checking the PARK position, move the lever slowly toward the NEUTRAL position until the lever drops at the end of the NEUTRAL stop in the selector gate.

If the starter also operates at this point, the gearshift linkage is properly adjusted.

This quick test also tests the adjustment of the neutral safety switch.

If the engine does not start in either or both of these positions, the neutral safety switch or the gear selector linkage needs adjustment or repair.

CAUTIONSince you must work under the vehicle to adjust most shift linkages make sure you properly raise and support the vehicle before working under it. Also, wear safety glasses or goggles while working under the vehicle.
A voltmeter can be used to check the switch for voltage when the ignition key is turned to the START position with the shift lever in PARK or NEUTRAL. If there is no voltage, the switch should be adjusted or replaced.

This could be the problem. If your dash indicator is showing reverse but the transmission is in park it could be the safety switch. I'm not talking about the safety switch in the transmission though. In automatics they put a second switch to kill the starter from engaging. You need to adjust the linkage. If your shifter isn't actually on the column but the indicators are there is a cable that attaches the floor shift to the column and that is adjustable. Put the Floor shifter in Park and turn the column section nearest the dash by hand until you find park. Then adjust the cable length as needed. If all you have is the column shift it is still a cable adjustment. Set the emergency brake, drop the shifter to low 1 and adjust the cable linkage by loosening it on the transmission and manually move it all the way to low 1 then tighten it down then move the shifter to park and repeat teh adjustment process to verify that it is properly aligned. Lock the linkage back down and see if the vehicle will start, if it doesn't move the shifter to neutral and try to start the vehicle if the vehicle starts then check the column shift safety switch at the park position to make sure it is still in place and working. Typically, if the vehicle won't start in Park or Neutral it is more likely to be the Transmission neutral safety switch.

This could be a faulty park/neutral safety switch. This is a switch that is used to determine whether the car is in park or neutral before allowing the car to start. This prevents the starter from turning while the transmission is engaged, which would cause the car to jolt forward. It's usually an easy fix, located on the side of the transmission. Remove the wiring harness, and carefully remove the switch, they tend to be brittle. You can replace it with a new one, or clean your old one (if it stayed intact). Just disassemble the switch, and clean all the old dirty grease off the contacts, and use a good electric grade lubricant. Good Luck!

?What do you mean NSS? Neutral Safety Switch? NSS is not an Abbreviation that I have ever heard of in 40 years. If you are talking about a Neutral Safety switch it is located in the transmission and would keep you from starting the vehicle unless it is in park or Neutral. Assuming you are talking about this and it's not the more common problem in the vehicles of the Linkage being out of adjustment it is located inside the transmission and can actually be replaced without any special tools or dropping the transmission in most cases.

Not having more specific info as to the behavior of your vehicle it's hard to say. what the problem might be. Computer codes are only a place to startt.The P0722 is for Output Speed Sensor 2 Circuit No Signal. This means that the transmission control module is not receiving a signal from the Output Speed Sensor. I am assuming (based on this information) that your vehicle is front wheel drive and has an automatic transmission. If you have a different powertrain (i.e. quattro all wheel drive or a manual transmission), write back and let me know. This P0722 is a common fault on front wheel drive automatic transmissions (called a CVT). The bad thing is that the output speed sensors are part of the transmission control module and the only way to repair that is to replace the transmission control module. The module is located inside the transmission. Expect to pay $1000 to $1500 for the module and another $700 to $900 for labor. There is a possibility it could be the Neutral safety switch. They an get dirty and cause problems so spend a cople of dolars checking this before laying out the bigger bucks. Testing Neutral Safety Switch

Test ProcedureLocate the neutral safety switchDisconnect the wiring connector at the switchUsing a test light or volt-meter test for power at the wiring harness with the key in the "engine crank" or the gear shifter in the "reverse" position. (do not start the engine)If power exists reconnect the neutral safety switch and probe outgoing wires at the connector.If no outgoing power is present the switch has failed and needs to be replaced.Tip : If the engine will not crank over with the car in "park" push down the brake pedal and try cranking the engine over with the car in "neutral". What you are doing is bypassing the "park" position in the switch and now are using the little used neutral circuit. If in neutral the engine starts the switch is probably bad.Tip: Sometimes a neutral safety switch can become misadjusted. This switch adjustment can change due to normal wear of mechanism that controls switch slider.Other complications can occur if there is a loose connection somewhere in the system. While this condition is not a shorted circuit problem, it is a condition that simply breaks the flow of electricity intermittently. To troubleshoot this problem consult a car repair manual to locate the wiring schematic for your car. Repair the broken or shorted connection as needed and recheck system. Electrical problems are less complicated when the proper information is available. Hope this helps you

Shifting to NEUTRALTo shift the transfer case to NEUTRAL, first make sure
the vehicle is parked so that it will not roll:
1. Set the parking brake.
2. Start the vehicle.
3. Connect the vehicle to the towing vehicle.
4. Put the transmission in NEUTRAL (N) or have
the clutch pedal pressed for vehicles with
manual transmission.
5. Shift the transfer case to 2HI.
6. Simultaneously press and hold the 2HI and
4LO buttons for 10 seconds. The red NEUTRAL
light will come on when the transfer case shift to
NEUTRAL is complete.
7. Shift the transmission to REVERSE (R) for one
second, then shift the transmission to DRIVE (D)
for one second or FIRST (1) for vehicles with
manual transmission.
8. Turn the ignition to OFF.
9. Place the transmission shift lever in PARK (P) or
FIRST (1) for vehicles with manual transmission.
10. Release the parking brake prior to towing.

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Shifting Out of NEUTRAL
To shift out of NEUTRAL:
1. Set the parking brake and apply the regular
brake pedal.
2. Start the vehicle with the transmission in PARK (P)
or FIRST (1) for vehicles with manual transmission.
3. Press the button for the desired transfer case position
(2HI, 4HI, AUTO 4WD or 4LO).
4. Put the transmission in NEUTRAL (N) or press the
clutch pedal for vehicles with manual transmission.
5. Shift the transmission lever to the desired position.
After the transfer case has shifted out of NEUTRAL,
the red light will go out.
6. A re-engagement sound is normal when shifting out
of NEUTRAL.

There is a problem in what is called a transmission range sensor. This sensor lets the ignition system know the vehicle is safe to start by being in Park or Neutral. Try replacing the sensor if that doesnt fix it check the wiring of the circuit.